Display device in which control signals supplied to first and second switches are made the same in an input sensing operation

ABSTRACT

According to one embodiment, a display device includes first and second substrate units, a display function layer, and a drive element. The first substrate unit includes a first substrate, a display unit, and a circuit unit. The first substrate has a first surface including a display region and a peripheral region. The display unit is provided in the display region, and includes first lines, second lines, switch elements, pixel electrodes, and third lines. The circuit unit is provided in the peripheral region, and is electrically connected to one of the second lines and one of the third lines. The second substrate unit includes a second substrate and fourth lines. The display function layer is provided between the first and second substrate units. The drive element is provided on the peripheral region. At least a portion of the circuit unit is disposed between the drive element and the first substrate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims the benefit of priorityunder 35 U.S.C. § 120 from U.S. application Ser. No. 15/626,619 filedJun. 19, 2017, which is a continuation of U.S. application Ser. No.14/708,761 filed May 11, 2015 (now U.S. Pat. No. 9,715,295 issued Jul.25, 2017), which claims the benefit of priority under 35 U.S.C. § 119from Japanese Patent Application No. 2014-116881 filed on Jun. 5, 2014;the entire contents of each of which are incorporated herein byreference.

FIELD

Embodiments described herein relate generally to a display device.

BACKGROUND

A display device that uses a liquid crystal, organic EL, etc., has beendeveloped. Other a display operation, for example, a sense operation ofa touch input may be performed in the display device. A compact deviceis desirable for such a display device.

SUMMARY OF THE INVENTION

According to one embodiment, a display device includes a first substrateunit, a second substrate unit, a display function layer, and a driveelement. The first substrate unit includes a first substrate, a displayunit, and a circuit unit. The first substrate has a first surfaceincluding a display region and a peripheral region. The display unit isprovided in the display region. The display unit includes a plurality offirst lines extending in a first direction and being arranged in asecond direction intersecting the first direction, the first directionintersecting a direction from the peripheral region toward the displayregion, a plurality of second lines extending in the second directionand being arranged in the first direction, a plurality of switchelements, each of the plurality of switch elements being electricallyconnected to one of the plurality of first lines and one of theplurality of second lines, a plurality of pixel electrodes electricallyconnected respectively to the plurality of switch elements, and aplurality of third lines extending in the second direction and beingarranged in the first direction. A circuit unit is provided in theperipheral region. A circuit unit is electrically connected to at leastone of the plurality of second lines and at least one of the pluralityof third lines. The second substrate unit includes a second substrateand a plurality of fourth lines. The second substrate has a secondsurface and a third surface. The second surface opposes the firstsurface. The third surface is on a side opposite to the second surface.The plurality of fourth lines is provided at the third surface. Theplurality of fourth lines extends in a third direction and is arrangedin a fourth direction. The third direction is parallel to the thirdsurface and intersects the second direction. The fourth direction isparallel to the third surface and intersects the third direction. Thedisplay function layer is provided between the first substrate unit andthe second substrate unit. The display function layer performs anoptical operation based on an electrical signal applied to the pluralityof pixel electrodes. The drive element is provided on the peripheralregion. The drive element is capable of outputting the electrical signalto the circuit unit. At least a portion of the circuit unit is disposedbetween the drive element and the first substrate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 A to FIG. 1C are schematic plan views showing a display deviceaccording to a first embodiment;

FIG. 2 is a schematic cross-sectional view showing the display deviceaccording to the first embodiment;

FIG. 3 is a schematic perspective view showing the display deviceaccording to the first embodiment;

FIG. 4 is a schematic view showing the display device according to thefirst embodiment;

FIG. 5 is a schematic cross-sectional view showing the display deviceaccording to the first embodiment;

FIG. 6 is a schematic view showing the display device according to thefirst embodiment;

FIG. 7 is a schematic view showing the display device according to thefirst embodiment;

FIG. 8 is a schematic view showing the first operation of the displaydevice according to the first embodiment;

FIG. 9 is a schematic view showing the second operation of the displaydevice according to the first embodiment;

FIG. 10 is a circuit diagram showing the display device according to thefirst embodiment;

FIG. 11 is a circuit diagram showing the display device according to thefirst embodiment;

FIG. 12 is a schematic cross-sectional view showing a portion of adisplay device according to a second embodiment; and

FIG. 13 is a schematic perspective view showing an electronic deviceaccording to a third embodiment.

DETAILED DESCRIPTION

Embodiments of the invention will now be described with reference to thedrawings.

The disclosure is but an example; and appropriate modifications withinthe spirit of the invention will be readily apparent to one skilled inthe art and naturally are within the scope of the invention. Moreover,although the widths, thicknesses, configurations, etc., of components inthe drawings may be illustrated schematically compared to the actualembodiments for better clarification of description, these are merelyexamples and do not limit the construction of the invention.

Further, in the specification and the drawings, components similar tothose described in regard to a drawing thereinabove are marked with likereference numerals, and a detailed description may be omitted asappropriate.

First Embodiment

FIG. 1A to FIG. 1C are schematic plan views showing a display deviceaccording to a first embodiment.

As shown in FIG. 1A, the display device 110 according to the embodimentincludes a first substrate unit 10 u, a second substrate unit 20 u, anda drive element 71.

FIG. 1B shows the first substrate unit 10 u. The first substrate unit 10u includes a first substrate 10, a display unit DP, and a circuit unit75. The first substrate 10 has a first surface 10 a. A display region10D and a peripheral region 10P are provided on the first surface 10 aside of the first substrate 10. The display unit DP is provided on thedisplay region 10D. The circuit unit 75 is provided on the peripheralregion 10P.

As described below, various lines, switch elements, and pixel electrodesare provided in the display unit DP. An example of the display unit DPis described below.

For example, one direction intersecting a direction from the peripheralregion 10P toward the display region 10D is taken as a first direction.The first direction is parallel to the first surface 10 a. The directiondescribed above from the peripheral region 10P toward the display region10D is taken as a second direction. A direction perpendicular to thefirst direction and the second direction is taken as a fifth direction.

The first direction is taken as an X-axis direction. A directionparallel to the first surface 10 a and perpendicular to the X-axisdirection is taken as a Y-axis direction. A direction perpendicular tothe X-axis direction and the Y-axis direction is taken as a Z-axisdirection. As described below, the Y-axis direction corresponds to thesecond direction; and the Z-axis direction corresponds to the fifthdirection.

A display is performed in the display region 10D. In the example shownin FIG. 1B, the first substrate unit 10 u further includes a first gatedriver 76 a, a second gate driver 76 b, and a multiplexer 77. Thedisplay region 10D is disposed in the region between the first gatedriver 76 a and the second gate driver 76 b. The multiplexer 77 isdisposed between the display region 10D and the circuit unit 75.

The first substrate unit 10 u further includes a first substrateconnector unit 78 a. The first substrate connector unit 78 a is providedin the peripheral region 10P of the first substrate 10. For example, thefirst substrate connector unit 78 a is electrically connected to atleast one of the circuit unit 75 or the gate drivers.

In the embodiment, the state of being electrically connected includesthe state in which two conductors are in direct contact, and the statein which a current flows between two conductors that have anotherconductor inserted therebetween. Further, the state of beingelectrically connected includes the state in which it is possible toform a state in which a current flows between two conductors that havean element (e.g., a switch element or the like) inserted therebetween.

FIG. 1C shows the second substrate unit 20 u. The second substrate unit20 u includes a second substrate 20 and multiple lines (fourth lines L4described below). The second substrate 20 has a second surface 20 a(referring to FIG. 2) and a third surface 20 b. The second surface 20 ais the surface that opposes the first surface 10 a. The third surface 20b is the surface on the side opposite to the second surface 20 a. Thefourth lines L4 are provided in the third surface 20 b. As describedbelow, the fourth lines L4 are used to sense a touch input. A secondsubstrate connector unit 78 b is provided in the second substrate 20.The second substrate connector unit 78 b is electrically connected tothe fourth lines L4.

In the example shown in FIG. 1A, the display device 110 further includesa first circuit substrate 81, a second circuit substrate 82, and asensor 83 (e.g., a touch sensing IC). The first circuit substrate 81 iselectrically connected to the first substrate connector unit 78 a. Thesecond circuit substrate 82 is electrically connected to the secondsubstrate connector unit 78 b. In the example shown in FIG. 1A, thesensor 83 is mounted on the second circuit substrate 82. For example,FPCs (Flexible Printed Circuits) are used as these circuit substrates.The sensor 83 and the drive element 71 can operate synchronously witheach other.

As shown in FIG. 1A, the drive element 71 is provided on the peripheralregion 10P of the first substrate 10. For example, the drive element 71and the second substrate unit 20 u do not overlap in the plane, evenwhen the drive element 71 and the first surface 10 a overlap in theplane.

FIG. 2 is a schematic cross-sectional view showing the display deviceaccording to the first embodiment.

FIG. 2 shows a line A1-A2 cross section of FIG. 1A.

As shown in FIG. 2, the drive element 71 is provided on the peripheralregion 10P of the first substrate 10. At least a portion of the circuitunit 75 is disposed between the drive element 71 and the first substrate10. In other words, the drive element 71 is disposed on at least aportion of the circuit unit 75.

Thereby, the surface area of the peripheral region 10P can be smallcompared to the case where the circuit unit 75 and the drive element 71do not overlap each other. Thereby, the device can be compact.

For example, the drive element 71 includes a lower surface electrode 71c and another lower surface electrode 71 d. The lower surface electrodes71 c and 71 d are provided on the surface of the drive element 71 on thefirst substrate 10 side. On the other hand, the first substrate unit 10u includes an line electrode 10 c and another line electrode 10 d. Theline electrodes 10 c and 10 d are provided in the peripheral region 10P.

The display device 110 further includes a connecting conductive member72 c and another connecting conductive member 72 d. The connectingconductive member 72 c is disposed between the lower surface electrode71 c and the line electrode 10 c and electrically connects the lowersurface electrode 71 c and the line electrode 10 c. The connectingconductive member 72 d is disposed between the lower surface electrode71 d and the line electrode 10 d and electrically connects the lowersurface electrode 71 d and the line electrode 10 d.

For example, a glass substrate may be used as the first substrate 10.For example, the drive element 71 is mounted on the first substrate 10by a COG (Chip on Glass) method.

In the example shown in FIG. 2, the first substrate connector unit 78 aand the first circuit substrate 81 are connected by a connection member81 c.

As shown in FIG. 2, a display function layer 30 is disposed between thefirst substrate unit 10 u and the second substrate unit 20 u. In theexample, a sealing unit 37 is provided between the first substrate unit10 u and the second substrate unit 20 u. For example, the sealing unit37 bonds the first substrate 10 and the second substrate 20. In theexample, the multiplexer 77 (at least a portion of the multiplexer 77)contacts the sealing unit 37. Thereby, the surface area of the regionsother than the display region 10D can be reduced.

An example of the various lines, switch elements, and pixel electrodesprovided in the display unit DP will now be described.

FIG. 3 is a schematic perspective view showing the display deviceaccording to the first embodiment.

As shown in FIG. 3, the display device 110 according to the embodimentincludes multiple first lines L1 (e.g., gate lines GL), multiple secondlines L2 (e.g., signal lines SL), and multiple third lines L3 (e.g.,common lines CL). The first lines L1, the second lines L2, and the thirdlines L3 are included in the display unit DP. The multiple fourth linesL4 also are shown in FIG. 3.

Each of the multiple first lines L1 extends in the first direction. Asdescribed above, the first direction is the direction intersecting thedirection from the peripheral region 10P toward the display region 10D.The multiple first lines L1 are arranged in the second direction. Thesecond direction intersects the first direction. In the example, thesecond direction is perpendicular to the first direction. The firstdirection is parallel to the X-axis direction; and the second directionis parallel to the Y-axis direction.

Each of the multiple second lines L2 extends in the second direction.The multiple second lines L2 are arranged in the first direction.

Each of the multiple third lines L3 extends in the second direction. Themultiple third lines L3 are arranged in the first direction.

The multiple fourth lines L4 are separated from the first to third linesL1 to L3 in a direction (a Z-axis direction, i.e., the fifth direction)perpendicular to the X-Y plane. Each of the multiple fourth lines L4extends in a third direction. The third direction is parallel to the X-Yplane and intersects the second direction. The multiple fourth lines L4are arranged in a fourth direction. The fourth direction is parallel tothe X-Y plane and intersects the third direction. In the example, thethird direction is parallel to the X-axis direction; and the fourthdirection is parallel to the Y-axis direction.

As described above, for example, the multiple first lines L1 are thegate lines GL. The multiple gate lines GL include, for example, a firstgate line GL1, a second gate line GL2, and an nth gate line GLn. Thenumber of gate lines GL is n. n is an integer not less than 2. Forexample, n is 2560. In the embodiment, n is arbitrary.

As described above, for example, the multiple second lines L2 are thesignal lines SL. The multiple signal lines SL include, for example, afirst signal line SL1, a second signal line SL2, and an mth signal lineSLm. The number of signal lines SL is m. m is an integer not less than2. For example, in the case where the set of a red pixel, a green pixel,and a blue pixel is used as one component, the number of components is1600. In the case where the number of components is 1600, m is1600×3=4800. The signal lines SL are provided according to the number ofmultiple pixels arranged along the first direction. In the embodiment, mis arbitrary.

As described above, for example, the multiple third lines L3 are thecommon lines CL. The multiple common lines CL include, for example, afirst common line CL1, a second common line CL2, and an Nth common lineCLN. The number of common lines CL is N. N is an integer not less than2. In the embodiment, N is arbitrary.

As described above, for example, the multiple fourth lines L4 are senselines RL. The multiple sense lines RL include, for example, a firstsense line RL1, a second sense line RL2, and an Mth sense line RLM. Thenumber of sense lines RL is M. M is an integer not less than 2. In theembodiment, M is arbitrary.

In the example, the signal lines SL and the common lines CL are disposedbetween the gate lines GL and the sense lines RL. In the embodiment,various modifications are possible for the arrangement of these lines inthe fifth direction. In other words, it is possible to arbitrarilychange the vertical relationship between the gate lines GL, the signallines SL, the common lines CL, and the sense lines RL.

As described below, the display is performed using the multiple gatelines GL, the multiple signal lines SL, and the multiple common linesCL. In the example, for example, an input (e.g., a touch input) isperformed using the multiple common lines CL and the multiple senselines RL. In the embodiment, the sense lines RL may be omitted in thecase where the input operation is not performed.

As described below, the circuit unit 75 recited above is electricallyconnected to at least one of the multiple second lines L2 (the signallines SL) and at least one of the multiple third lines (the common linesCL).

As shown in FIG. 3, for example, the number m of signal lines SL islarger than the number N of common lines CL. By setting the number ofsignal lines SL to be large, a high definition display can beimplemented. On the other hand, there are many cases where theresolution of the input may be lower than the resolution of the display.Therefore, the number of common lines CL can be smaller than the numberof gate lines GL. By setting the number of common lines CL to be small,the time necessary for the sense operation can be shorter; and a displayhaving no incongruity or low incongruity becomes possible.

For example, the multiple signal lines SL are divided into multiplegroups. For example, the multiple signal lines SL include first to kthgroups, etc. Each of the multiple groups includes multiplemutually-adjacent signal lines SL. For example, the number of signallines SL included in one group is j. j is an integer not less than 2.

For example, each of the groups of the multiple signal lines SL and onecommon line CL (i.e., the multiple common lines CL respectively) overlapwhen projected onto the X-Y plane.

FIG. 4 is a schematic view showing the display device according to thefirst embodiment.

As shown in FIG. 4, multiple switch elements 11, multiple pixelelectrodes Px, and the display function layer 30 are provided in thedisplay device 110. The switch elements 11 and the pixel electrodes Pxare included in the display unit DP. Each of the multiple switchelements 11 is electrically connected to one of the multiple first linesL1 (the gate lines GL) and one of the multiple second lines L2 (thesignal lines SL).

For example, the switch element 11 includes a gate 11 g and asemiconductor layer 12. The semiconductor layer 12 includes a firstportion 12 a and a second portion 12 b. The gate 11 g is electricallyconnected to one of the multiple gate lines GL. The first portion 12 aof the semiconductor layer 12 is electrically connected to one of themultiple signal lines SL.

The multiple pixel electrodes Px are electrically connected respectivelyto the multiple switch elements 11. For example, one pixel electrode Pxis electrically connected to the second portion 12 b of thesemiconductor layer 12 of the switch element 11.

The display function layer 30 performs an optical operation based on anelectrical signal applied to the multiple pixel electrodes Px. Theoptical operation includes at least one of light emission or a change ofan optical characteristic. As described below, for example, the displayfunction layer 30 is provided between the multiple pixel electrodes Pxand the multiple sense lines RL. The drive element 71 is capable ofoutputting the electrical signal applied to the pixel electrodes Px tothe circuit unit 75. The electrical signal is supplied to the pixelelectrodes Px via the drive element 71.

In the case where a liquid crystal layer is used as the display functionlayer 30, the optical operation includes a change of an opticalcharacteristic. The optical characteristic includes, for example, atleast one of birefringence, optical rotatory properties, scatteringproperties, light reflectance, or light absorptance. For example, theelectrical signal that is applied to the pixel electrodes Px generatesan electric field between the pixel electrodes Px and the common linesCL or between the pixel electrodes Px and common electrodes connected tothe common lines CL. The liquid crystal alignment of the displayfunction layer 30 (the liquid crystal layer) changes due to the electricfield that is generated; and the effective birefringence changes. Atleast one of optical rotatory properties, scattering properties, lightreflectance, or light absorptance may change. Although a liquid crystallayer is used as the display function layer 30 in the display device 110shown in FIG. 4, a light emitting layer may be used instead of theliquid crystal layer in the display device 110.

In the case where a light emitting layer (e.g., an organic lightemitting layer) is used as the display function layer 30, the opticaloperation includes light emission (the emission of light). In the casewhere organic electro luminescence is used as an example of the organiclight emitting layer, electrons move from one electrode; and holes movefrom the other electrode. The light emission is produced by theelectrons and the holes recombining in the light emitting layer. Also,it is possible to use an inorganic light emitting layer instead of theorganic light emitting layer as the light emitting layer.

In other words, the display function layer 30 performs an opticaloperation of at least one of light emission or a change of an opticalcharacteristic.

In the case where, for example, a liquid crystal layer is used as thedisplay function layer 30, the display function layer 30 is used as aload capacitance. In the example shown in FIG. 4, a storage capacitor Csis provided in parallel with the display function layer 30. The storagecapacitor Cs may be provided as necessary and may be omitted.

Multiple pixels 35 are provided in the display device 110. At least oneswitch element 11 and at least one pixel electrode Px are provided ineach of the multiple pixels 35. In other words, the multiple switchelements 11 are provided respectively in the multiple pixels 35. Themultiple pixel electrodes Px are provided respectively in the multiplepixels 35.

As shown in FIG. 4, a drive unit 60 is provided in the display device110.

The drive unit 60 includes, for example, a first drive circuit 61, asecond drive circuit 62, and a controller 63. The first drive circuit 61is electrically connected to the multiple gate lines GL. The seconddrive circuit 62 is electrically connected to the multiple signal linesSL and the multiple common lines CL. The controller 63 is electricallyconnected to the first drive circuit 61 and the second drive circuit 62.The appropriate signal processing of the electrical signals acquired bythe controller 63 is performed. The electrical signals for which thesignal processing is performed are supplied to the first drive circuit61 and the second drive circuit 62. The electrical signals include theimage signal.

The optical operation of the display function layer 30 (e.g., the liquidcrystal layer) at the multiple pixels 35 is controlled by the gate linesGL, the signal lines SL, the switch elements 11, and the pixelelectrodes Px. In the display operation, for example, the common linesCL are utilized as counter electrodes of the pixel electrodes Px. Inother words, the potential of each of the multiple pixel electrodes Pxis controlled by the electrical signal being supplied to the pixelelectrode Px via the switch element 11. The display is performed by thealignment of the liquid crystal changing due to the electric fieldgenerated by the pixel electrodes Px and the common lines CL.

For example, the first gate driver 76 a and the second gate driver 76 bshown in FIG. 1B are included in the first drive circuit 61. Forexample, the drive element 71 and the circuit unit 75 shown in FIG. 2are included in the second drive circuit 62. In the case where themultiplexer 77 is provided, the multiplexer 77 may be included in thesecond drive circuit 62.

A sense circuit 65 may be further provided in the drive unit 60. Thesense circuit 65 is electrically connected to the sense lines RL. In thesense operation, for example, the change of the capacitance that isformed between each of the multiple common lines CL and each of themultiple sense lines RL is sensed by the second drive circuit 62 and thesense circuit 65. For example, the sensor 83 shown in FIG. 1A isincluded in the sense circuit 65.

For example, the touch input to the display device 110 is sensed by themultiple sense lines RL and the multiple common lines CL. In the senseoperation, for example, an input member (e.g., an input pen, etc.), afinger of a viewer (a user) of the display device 110, etc., is incontact with or proximal to the display device 110. The electrostaticcapacitance that is formed by the sense lines RL and the common lines CLchanges due to the contact or proximity recited above. The touch inputis sensed by sensing the change of the electrostatic capacitance. Forexample, electrostatic-capacitance type sensing is performed. It can besaid that such a display device 110 is a display device that has aninput function.

In the embodiment, the common lines CL (the third lines L3) are used ascounter electrodes for the sensing while being used as counterelectrodes for the display.

As shown in FIG. 4, the multiple pixels 35 include a first color pixel35 a and a second color pixel 35 b. For example, the multiple pixelelectrodes Px include a first color pixel electrode Pxa for the firstcolor and a second color pixel electrode Pxb for the second color. Thesecond color is different from the first color. The multiple signallines SL include a first color line SLa and a second color line SLb. Thefirst color line SLa is electrically connected to the first color pixelelectrode Pxa via one of the multiple switch elements 11. The secondcolor line SLb is electrically connected to the second color pixelelectrode Pxb via one other of the multiple switch elements 11. Further,a third color pixel and a third pixel electrode may be provided.Accordingly, a third color line may be provided. Further, pixels 35having four or more colors may be provided. An example of the case wherepixels 35 of three colors are provided will now be described.

FIG. 5 is a schematic cross-sectional view showing the display deviceaccording to the first embodiment.

As shown in FIG. 5, the first substrate unit 10 u, the second substrateunit 20 u, and the display function layer 30 are provided in the displaydevice 110. The multiple pixels 35 are provided in the display device110. FIG. 5 shows a portion of one pixel 35.

For example, an array substrate is used as the first substrate unit 10u. For example, the first substrate 10, the gate lines GL (the firstlines L1), the switch elements 11, the signal lines SL (the second linesL2), the common lines CL (the third lines L3), and the pixel electrodesPx are provided in the first substrate unit 10 u.

For example, the gate lines GL and the signal lines SL extend in the X-Yplane. The first substrate unit 10 u extends in the X-Y plane.

The first substrate 10 shown in FIG. 5 is light-transmissive. Forexample, glass or a resin is used as the first substrate 10. The gatelines GL are provided on the first substrate 10.

In the embodiment, a thin film transistor (TFT) is used as the switchelement 11. The switch element 11 includes the semiconductor layer 12.The semiconductor layer 12 includes the first portion 12 a, the secondportion 12 b, and a third portion 12 c. The second portion 12 b isseparated from the first portion 12 a in the X-Y plane. The thirdportion 12 c is disposed between the first portion 12 a and the secondportion 12 b. The first portion 12 a is used as one of the source ordrain of the switch element 11. The second portion 12 b is used as theother of the source or drain. The third portion 12 c is used as thechannel portion of the switch element 11.

The switch element 11 further includes the gate 11 g and a gateinsulator film 11 i. The gate insulator film 11 i is provided betweenthe third portion 12 c and the gate 11 g. In FIG. 5, the third portion12 c is disposed on the gate 11 g. In the example, the switch element 11has a bottom-gate structure. In the embodiment, the switch element 11may have a top-gate structure.

A first metal layer is used as at least one of the gate line GL or thegate 11 g. The first metal layer includes, for example, at least one ofMo (molybdenum), MoW (molybdenum-tungsten), Al (aluminum), or Cu(copper). For example, the first metal layer includes Mo. The gate lineGL and the gate 11 g may be formed using different materials or may beformed in the same layer using the same material. In the case where thegate line GL and the gate 11 g are formed using the different material,a connection region is provided; and the gate line GL and the gate 11 gare connected electrically.

The semiconductor layer 12 includes, for example, at least one ofpolysilicon, amorphous silicon, or crystalline silicon. An oxidesemiconductor may be used as the semiconductor layer 12. For example,the semiconductor layer 12 may include an oxide including at least oneof indium (In), gallium (Ga), or zinc (Zn).

The signal line SL is electrically connected to the first portion 12 a.The signal line SL shown in FIG. 5 includes a first connection portion15 a in the region on an inter-layer insulating layer 13, and a firstconnecting conductive portion 15 c in the region inside the inter-layerinsulating layer 13. In FIG. 5, the first connecting conductive portion15 c which is a portion of the signal line SL is electrically connectedto the first portion 12 a.

On the other hand, a draw-out electrode that is connected to the pixelelectrode Px is provided on the second portion 12 b. The draw-outelectrode includes a second connection portion 15 b in the region on theinter-layer insulating layer 13, and a second connecting conductiveportion 15 d in the region inside the inter-layer insulating layer 13.In FIG. 5, the second connecting conductive portion 15 d is electricallyconnected to the second portion 12 b.

A second metal layer is used as the first connection portion 15 a andthe first connecting conductive portion 15 c which are portions of thesignal line SL and as the second connection portion 15 b and the secondconnecting conductive portion 15 d which are portions of the draw-outelectrode. The second metal layer includes, for example, at least one ofAl (aluminum) or Cu (copper). For example, the second metal layerincludes Al.

The inter-layer insulating layer 13 is provided between the firstconnection portion 15 a of the signal line SL and the semiconductorlayer 12 and between the second connection portion 15 b of the draw-outelectrode and the semiconductor layer 12. As described above, the firstconnecting conductive portion 15 c and the second connecting conductiveportion 15 d are provided inside the inter-layer insulating layer 13.

The inter-layer insulating layer 13 includes, for example, an oxide, anitride, etc. The inter-layer insulating layer 13 includes, for example,at least one of silicon oxide, silicon nitride, or silicon oxynitride.

In FIG. 5, the common line CL is provided on the second metal layer ofthe signal line SL, etc. A first insulating layer I1 is provided betweenthe common line CL and the signal line SL. The first insulating layer I1is provided between the multiple signal lines SL and the multiple commonlines CL.

For example, the first insulating layer I1 functions as a planarizationlayer. For example, the first insulating layer I1 includes an organicmaterial. The first insulating layer I1 includes, for example, at leastone of an acrylic resin or a polyimide resin. Good flatness is obtainedby using the organic material as the first insulating layer I1. Insteadof the organic material, an inorganic material may be used as the firstinsulating layer I1.

The pixel electrode Px is provided on the common line CL. In FIG. 5, thepixel electrode Px has a comb-shaped configuration; and the pixelelectrode Px includes multiple portions Pxs. The multiple portions Pxsare separated from each other in the X-Y plane. The pixel electrode Pxis electrically connected to the second connection portion 15 b. In FIG.5, a third connecting conductive portion 17 which is a portion of thepixel electrode Px is electrically connected to the second connectionportion 15 b.

For example, a light-transmissive conductive layer is used as at leastone of the common line CL or the pixel electrode Px. For example, atleast one of the common line CL or the pixel electrode Px includes anoxide including at least one element selected from the group consistingof In, Sn, Zn, and Ti. The common line CL and the pixel electrode Pxinclude, for example, ITO (Indium Tin Oxide), etc. For example, thinmetal layers that are light-transmissive may be used as the common lineCL and the pixel electrode Px. As described below, a supplemental linemay be provided for the common line CL.

A second insulating layer I2 is provided between the pixel electrode Pxand the common line CL. In FIG. 5, at least a portion of the multiplecommon lines CL is disposed between at least a portion of one of themultiple pixel electrodes Px and at least a portion of one of themultiple signal lines SL. Also, the second insulating layer I2 isdisposed between the at least a portion of the multiple common lines CLrecited above and the at least a portion of the one of the multiplepixel electrodes Px recited above.

The second insulating layer I2 may include, for example, the samematerial as the first insulating layer I1; or a different material maybe used. The material of the second insulating layer I2 is arbitrary.

In FIG. 5, a first alignment film 18 is provided on the pixel electrodePx.

The second substrate unit 20 u is separated from the first substrateunit 10 u in the Z-axis direction. In FIG. 5, the second substrate unit20 u includes the second substrate 20, a color filter layer 25, a secondalignment film 28, and the sense lines RL (the fourth lines L4). Thesense lines RL are separated from the switch elements 11 and themultiple pixel electrodes Px. The second substrate 20 is providedbetween the sense lines RL and the first substrate unit 10 u. The colorfilter layer 25 is provided between the second substrate 20 and thefirst substrate unit 10 u. The second alignment film 28 is providedbetween the color filter layer 25 and the first substrate unit 10 u.

In FIG. 5, the second substrate 20 is light-transmissive. The secondsubstrate 20 includes, for example, glass or a resin.

For example, a light-transmissive conductive material is used as thematerial of the sense line RL. The sense line RL includes an oxide(e.g., ITO, etc.) including at least one element selected from the groupconsisting of In, Sn, Zn, and Ti. A thin metal layer that islight-transmissive may be used as the sense line RL. A metal line may beused as the sense line RL. In the case where the metal line is used asthe sense line RL, it is favorable for the metal line to be as fine aspossible to not be visible. Also, in the case where the metal line isused as the sense line RL, it is necessary to suppress moiré that occursdue to the relationship of the arrangement between the metal lines, thearrangement between the metal line and the color filter layer 25described below, and the arrangement between the metal line and thepixels. To suppress the moiré, the metal lines may have a configurationin which metal pieces having a prescribed length are disposed with aprescribed angle between mutually-adjacent metal pieces.

The color filter layer 25 includes, for example, a red colored layer, agreen colored layer, a blue colored layer, etc. In the example, alight-shielding layer BM that shields the TFT is formed in the samelayer as the color filter layer 25. The red colored layer, the greencolored layer, and the blue colored layer are disposed to respectivelycorrespond to the multiple pixels 35. The color filter layer 25 may havefour or more colors. In the embodiment, the color filter layer 25 may beomitted. The color filter layer 25 may be provided in the firstsubstrate unit 10 u.

The first alignment film 18 and the second alignment film 28 include,for example, polyimide, etc. Alignment processing (e.g., rubbing, etc.)of these alignment films is performed as necessary. Or, aphoto-alignment film may be used as the alignment film. For example, aphoto-alignment film that is formed from a polyimide precursor may beused as such a photo-alignment film.

The display function layer 30 is provided between the first substrateunit 10 u and the second substrate unit 20 u. The display function layer30 is disposed between the multiple pixel electrodes Px and the multiplesense lines RL. For example, the display function layer 30 is disposedbetween the first alignment film 18 and the second alignment film 28.

A first polarizing layer 51 and a second polarizing layer 52 areprovided in FIG. 5. The first substrate unit 10 u is disposed betweenthe first polarizing layer 51 and the second polarizing layer 52. Thesecond substrate unit 20 u is disposed between the first substrate unit10 u and the second polarizing layer 52.

A backlight unit 55 is further provided in FIG. 5. The first polarizinglayer 51, the first substrate unit 10 u, the display function layer 30,and the second substrate unit 20 u are disposed between the backlightunit 55 and the second polarizing layer 52. The backlight unit 55 emitslight. The light passes through the first polarizing layer 51, the firstsubstrate unit 10 u, the display function layer 30, the second substrateunit 20 u, and the second polarizing layer 52 and is emitted outside thedisplay device 110. The light that is modulated by the display functionlayer 30 is visible as an image.

In FIG. 5, the pixel electrode Px includes the multiple portions Pxs. A“lateral electric field” is generated between the pixel electrode Px andthe common line CL. The lateral electric field is an electric fieldhaving a component parallel to the X-Y plane. The director (thelong-axis direction of the liquid crystal molecules) of the liquidcrystal molecules of the display function layer 30 (the liquid crystallayer) is caused to change in the X-Y plane by the lateral electricfield. For example, at least one of birefringence or optical rotatoryproperties changes due to the change of the direction of the director.In other words, a change of an optical characteristic occurs. The changeof the optical characteristic is converted to a change of thetransmittance by using a polarizing layer.

The transmittance of the light emitted from the backlight unit 55changes due to the change of the optical characteristic. Thetransmittance of the light changes, that is, the brightness changes,according to the electrical signal (the image signal) applied to thepixel electrode Px. The light of which the brightness has changed isemitted from an upper surface Uf of the display device 110. Thereby, thedisplay is performed.

On the other hand, as described above, the touch input to the uppersurface Uf of the display device 110 is sensed by the multiple senselines RL and the multiple common lines CL from the change of theelectrostatic capacitance that is formed. The touch input may be sensedby sensing at least one of an electric field generated between themultiple sense lines RL and a finger of a viewer, an input member, etc.,or an electric field generated between the multiple common lines CL andthe finger of the viewer, the input member, etc.

At least a portion of the drive unit 60 may be provided in the firstsubstrate unit 10 u. At least a portion of the drive unit 60 may beincluded in the drive device of the display device. At least a portionof the drive device may be included in the drive unit 60.

An example of the drive element 71 and the circuit unit 75 of thedisplay device 110 will now be described.

FIG. 6 is a schematic view showing the display device according to thefirst embodiment.

FIG. 6 shows a portion of the display device 110.

As shown in FIG. 6, the multiple first lines L1 (the gate lines GL)include an ith gate line Gate<i> and an (i+1)th gate line Gate<i+1>.

For example, FIG. 6 shows a display device in which the pixel electrodesPx corresponding to red (R), green (G), and blue (B) are disposed.

The multiple second lines L2 (the signal lines SL) include a firstsignal line SI1. For example, the first signal line SI1 corresponds to afirst color pixel (e.g., an R color pixel). In the example, the multiplesecond lines L2 further include a second signal line SI2 and a thirdsignal line SI3. For example, the second signal line SI2 corresponds toa second color pixel (e.g., a G pixel). For example, the third signalline SI3 corresponds to a third color pixel (e.g., a B pixel).

The multiple third lines L3 (the common lines CL) include a first commonline CI1.

The second drive circuit 62 (the drive unit 60) includes a first sourcecircuit SC1 and a second source circuit SC2. These source circuits arecapable of outputting electrical signals used as at least a portion ofthe image signals. These source circuits are source amplifiers. Forexample, these source circuits are included in the drive element 71 (afirst drive unit 62 a).

The second drive circuit 62 further includes a sense potential line SVI,a first sense potential switch SVS1, a second sense potential switchSVS2, a first ground potential switch SVSG1, a second ground potentialswitch SVSG2, a first source switch SS1, and a second source switch SS2.For example, these switches are included in the circuit unit 75. Inother words, these switches are provided between the drive element 71and the first substrate 10. The circuit unit 75 includes, for example,the semiconductor layer 12 of the switch elements 11 included in thedisplay unit DP. The circuit unit 75 includes the material included inat least one of the first metal layer or the second metal layerdescribed above. An example is illustrated in FIG. 6 in which p-channeltransistors are used as the first sense potential switch SVS1 and thesecond sense potential switch SVS2, and n-channel transistors are usedas the first ground potential switch SVSG1 and the second groundpotential switch SVSG2. The configuration is not limited to the exampleof FIG. 6. Switches having other configurations may be used as the firstsense potential switch SVS1, the second sense potential switch SVS2, thefirst ground potential switch SVSG1, and the second ground potentialswitch SVSG2.

In other words, the circuit unit 75 includes switches; and the switchesinclude the same material as the semiconductor layer 12 included in theswitch elements 11. The circuit unit 75 includes the same material asthe metal layer included in at least one of the first to third lines L1to L3.

The second drive circuit 62 includes a display counter potential lineCOMI, a first signal line switch SIS1, a second signal line switch SIS2,a third signal line switch SIS3, a first common switch CS1, a secondcommon switch CS2, a third common switch CS3, and a fourth common switchCS4. For example, these switches and the circuit unit 75 are included ina second drive unit 62 b.

The display counter potential line COMI is set to a display counterpotential COMDC. The display counter potential COMDC is, for example, 0volts (e.g., a ground potential) to −1 volts. The value of the potentialis an example; and the embodiment is not limited thereto.

The sense potential line SVI is set to a potential (e.g., a touchoperation potential TPH) that is different from the display counterpotential COMDC. The touch operation potential TPH (the sense potential)is, for example, 4 volts to 10 volts. The values of the potentials areexamples; and the embodiment is not limited thereto.

One end of the first sense potential switch SVS1 is electricallyconnected to the sense potential line SVI (the touch operation potentialTPH).

One end of the first ground potential switch SVSG1 is electricallyconnected to the other end SO1 of the first sense potential switch SVS1.The other end of the first ground potential switch SVSG1 is electricallyconnected to a ground potential GND. The ground potential GND isdifferent from the sense potential.

One end of the second sense potential switch SVS2 is electricallyconnected to the sense potential line SVI.

One end of the second ground potential switch SVSG2 is electricallyconnected to the other end SO2 of the second sense potential switchSVS2. The other end of the second ground potential switch SVSG2 isconnected to the ground potential GND.

One end (a terminal DDI-OUT) of the first source switch SS1 is connectedto the other end SO1 of the first sense potential switch SVS1. The otherend of the first source switch SS1 is connected to the output of thefirst source circuit SC1 or the output of the second source circuit SC2.In other words, the first source switch SS1 switches between the statein which the other end SO1 of the first sense potential switch SVS1 isconnected to the output of the first source circuit SC1 and the state inwhich the other end SO1 of the first sense potential switch SVS1 isconnected to the output of the second source circuit SC2.

One end of the second source switch SS2 is connected to the other endSO2 of the second sense potential switch SVS2. The other end of thesecond source switch SS2 is connected to the output of the second sourcecircuit SC2 or the output of the first source circuit SC1. In otherwords, the second source switch SS2 switches between the state in whichthe other end SO2 of the second sense potential switch SVS2 is connectedto the output of the second source circuit SC2 and the state in whichthe other end SO2 of the second sense potential switch SVS2 is connectedto the output of the first source circuit SC1.

One end of the first signal line switch SIS1 is electrically connectedto the first signal line SI1. The other end of the first signal lineswitch SIS1 is electrically connected to the other end SO1 of the firstsense potential switch SVS1.

One end of the second signal line switch SIS2 is electrically connectedto the second signal line SI2. The other end of the second signal lineswitch SIS2 is electrically connected to the other end SO1 of the secondsense potential switch SVS2.

One end of the third signal line switch SIS3 is electrically connectedto the third signal line SI3. The other end of the third signal lineswitch SIS3 is electrically connected to the other end SO1 of the firstsense potential switch SVS1 (i.e., the other end of the first signalline switch SIS1).

One end of the first common switch CS1 is electrically connected to thedisplay counter potential line COMI. The other end of the first commonswitch CS1 is electrically connected to the first common line CI1.

One end of the second common switch CS2 is electrically connected to theother end SO1 of the first sense potential switch SVS1 (i.e., the otherend of the first signal line switch SIS1). The other end of the secondcommon switch CS2 is electrically connected to the first common lineCI1.

One end of the third common switch CS3 is electrically connected to thedisplay counter potential line COMI. The other end of the third commonswitch CS3 is electrically connected to the first common line CI1.

One end of the fourth common switch CS4 is electrically connected to theother end SO2 of the second sense potential switch SVS2 (i.e., the otherend of the second signal line switch SIS2). The other end of the fourthcommon switch CS4 is electrically connected to the first common lineCI1.

For example, the first signal line switch SIS1, the second signal lineswitch SIS2, and the third signal line switch SIS3 are included in aselector switch SEL_SW.

For example, the first common switch CS1, the second common switch CS2,the third common switch CS3, and the fourth common switch CS4 areincluded in a common selector COM_SEL.

In FIG. 6, another common selector COM_SEL0 is provided. The gate linesGL are disposed between the common selector COM_SEL0 and the selectorswitch SEL_SW. The common selector COM_SEL0 electrically connects eachof the common lines CL (e.g., the first common line CI1) to one of thedisplay counter potential COMDC or an line CC. The common selectorCOM_SEL0 and the line CC are included in a third drive unit 62 c.

Thus, the drive unit 60 includes the common selector COM_SEL, theselector switch SEL_SW, and the display counter potential line COMI thatis set to the display counter potential COMDC. One end of the circuitunit 75 is electrically connected to the drive element 71. The other endof the circuit unit 75 is electrically connected to the selector switchSEL_SW and the common selector COM_SEL.

In the display device 110, a first operation and a second operation areimplemented by these circuits. The first operation is, for example, thedisplay operation. The second operation is the non-display operation.The second operation is, for example, the input sensing operation.

FIG. 6 shows the first operation OP1 of the display device 110.

In the first operation OP1 as shown in FIG. 6, the selector switchSEL_SW electrically connects the circuit unit 75 and each of themultiple second lines L2 (the signal lines SL). In FIG. 6, the firstsignal line switch SIS1 and the second signal line switch SIS2 are inthe conducting state; and the third signal line switch SIS3 is in thenonconducting state.

The common selector COM_SEL electrically connects the display counterpotential line COMI and each of the multiple third lines L3 (the commonlines CL). Thereby, the electrical signals that include the desiredimage signals are supplied to the signal lines SL from the drive element71. The signals based on the image signals supplied to the signal linesSL are supplied to the pixel electrodes Px. A display that correspondsto the potential difference generated between the pixel electrodes Pxand the common lines CL is performed in the display function layer 30.In FIG. 6, the first common switch CS1 and the third common switch CS3are in the conducting state; and the second common switch CS2 and thefourth common switch CS4 are in the nonconducting state.

The timing of the conducting state or the nonconducting state of theswitches for each operation is described below.

In the display period of the first operation OP1, one of the multipleswitch elements 11 connected to one of the multiple first lines L1 andone of the multiple second lines L2 is selected. The switch element 11that is selected is called a selection switch element 11sel. An imagepotential is applied to the pixel electrode (a selection pixel electrodePxsel) electrically connected to the selection switch element 11sel ofthe multiple pixel electrodes Px. On the other hand, the display counterpotential COMDC is applied to at least one of the multiple third linesL3. In the first operation OP1, the image signal is supplied to themultiple second lines L2 while setting one of the multiple first linesL1 to the select potential. The multiple switch elements 11 include theselection switch element 11sel. The selection switch element 11sel iselectrically connected to the first line L1 of the multiple switchelements 11 set to the select potential recited above. The multiplepixel electrodes Px include the selection pixel electrode Pxsel. Theselection pixel electrode Pxsel is electrically connected to theselection switch element 11sel. The selection pixel electrode Pxsel isset to an image potential based on the image signal. On the other hand,at least one of the multiple third lines L3 is set to the displaycounter potential COMDC. Thereby, the display is performed.

FIG. 7 is a schematic view showing the display device according to thefirst embodiment.

FIG. 7 shows a portion of the display device 110. FIG. 7 shows the stateof the second operation OP2 of the display device 110.

In the second operation OP2 as shown in FIG. 7, neither the first sourceswitch SS1 nor the second source switch SS2 are connected to any line.Therefore, the circuit unit 75 electrically disconnects the driveelement 71 from each of the multiple second lines L2 (the signal linesSL).

The common selector COM_SEL electrically connects at least one of themultiple third lines L3 (the common lines CL) and at least one of themultiple second lines L2 (the signal lines SL). An example isillustrated in FIG. 7 in which the second common switch CS2 of thecommon selector COM_SEL is in the conducting state, and the first signalline switch SIS1 and the third signal line switch SIS3 are in theconducting state. Thereby, in the second operation OP2, the second linesL2 are set to the same potential as the potential of the third lines L3.

Thus, in the second operation OP2, a capacitance substantially is notformed between the second lines L2 and the third lines L3. For example,when performing the sense operation using the third lines L3 and thefourth lines L4, the load capacitance can be small; and a high-speedoperation is possible.

According to the embodiment as described in regard to FIGS. 1A and 1Band FIG. 2, because the circuit unit 75 is disposed under the driveelement 71, the surface area of the peripheral region 10P can be small;and the device can be compact.

FIG. 8 is a schematic view showing the first operation of the displaydevice according to the first embodiment.

FIG. 8 is a timing chart of the first operation OP1. The horizontal axisof FIG. 8 is time.

The first operation OP1 is implemented in a display period DT as shownin FIG. 8. For example, the display period DT includes a first displayperiod DT1 to a kth display period. In the first display period DT1, thefirst to kth gate lines GL are scanned by being sequentially selected.In a second display period (not shown), the (k+1)th to 2kth gate linesGL are scanned by being sequentially selected. The scanning period (1H)of the ith gate line Gate<i> and the scanning period (1H) of the (i+1)thgate line Gate<i+1> that are included in the first display period DT1are shown in FIG. 8.

In the example, for example, the output of the terminal DDI-OUTcorresponds to the output of the first source circuit SC1.

A signal SEL1 is the signal that determines the conducting state or thenonconducting state of the first signal line switch SIS1. The signal ofthe second signal line switch SIS2 is the same as the signal of thefirst signal line switch SIS1. A signal SEL2 is the signal of the thirdsignal line switch SIS3. For these signals, these switches are in theconducting state in the high state “H.” In the low state “L,” theseswitches are in the nonconducting (disconnected) state.

For the first to fourth common switches CS1 to CS4 of the commonselector COM_SEL, these common switches electrically conduct in the highstate “H.” In the low state “L,” these common switches are in theelectrically nonconducting (disconnected) state.

In the first operation OP1 (the display operation), the switch elements11 are in the electrically conducting state when the ith gate lineGate<i> and the (i+1)th gate line Gate<i+1> are in the high state “H.”In the low state “L,” the switch elements 11 are switched to thenonconducting (disconnected) state.

For example, the ith gate line Gate<i> is switched to the conductingstate in one period of 1H. The time between the start of an period of 1Hand the start of the conducting state of the gate line is a time t12.Subsequently, the conducting state is provided for a time t13. In oneother period of 1H, the (i+1)th gate line Gate<i+1> is switched to theconducting state.

The first source circuit SC1 outputs an image signal 1sel for a time t1inside the period of 1H. For a time t2 (an period of a high resistancestate Hi-Z (high impedance)) after the time t1, the first source circuitSC1 pauses the output of the image signal. For a time t3 after the timet2, the first source circuit SC1 outputs an image signal 2sel. For atime (the state of the high resistance state Hi-Z) after the time t3,the first source circuit SC1 pauses the output of the image signal.

For a time t5, the first signal line switch SIS1 and the second signalline switch SIS2 are switched to the high state “H.” The time betweenthe start of the time t1 and the start of the time t5 is a time t4. Thefirst signal line switch SIS1 and the second signal line switch SIS2 arein the low state “L” for the time t2 and the time t3.

The third signal line switch SIS3 is in the low state “L” for the timet1. The time between the start of the time t1 and the start of the timet5 is the time t4. The third signal line switch SIS3 is switched to thehigh state “H” for a time t7. The time between the start of the time t1and the start of the time t7 is a time t6.

On the other hand, the first common switch CS1 and the third commonswitch CS3 are in the high state “H.” On the other hand, the secondcommon switch CS2 and the fourth common switch CS4 are in the low state“L.”

In other words, the following are implemented in the first operation OP1(the display operation).

The first sense potential switch SVS1 electrically disconnects the otherend of the first signal line switch SIS1 from the sense potential lineSVI.

The first ground potential switch SVSG1 electrically disconnects theother end of the first signal line switch SIS1 from the ground potentialGND.

The first source circuit SC1 outputs a signal of a portion of the imagesignal.

The first source switch SS1 electrically connects the first sourcecircuit SC1 to the other end of the first signal line switch SIS1.

The first signal line switch SIS1 electrically connects the other end ofthe first source switch SS1 to the first signal line SI1.

The first common switch CS1 electrically connects the first common lineCI1 and the display counter potential line COMI.

The second common switch CS2 electrically disconnects the first commonline CI1 from the first signal line SI1.

Thereby, the desired display is performed at the pixels 35 correspondingto the first signal line SI1.

At this time, the third signal line switch SIS3 electrically disconnectsthe third signal line SI3 from the other end of the first source switchSS1.

Further, the following are performed in the first operation OP1.

The second sense potential switch SVS2 electrically disconnects theother end of the second signal line switch SIS2 from the sense potentialline SVI.

The second ground potential switch SVSG2 electrically disconnects theother end of the second signal line switch SIS2 from the groundpotential GND.

The second source circuit SC2 outputs a portion of the pixel signal. Forexample, the signal that is output from the second source circuit SC2 isdifferent from the signal output from the first source circuit SC1. Forexample, the polarity of the signal output from the second sourcecircuit SC2 is the reverse of the polarity of the signal output from thefirst source circuit SC1.

The second source switch SS2 electrically connects the second sourcecircuit SC2 to the other end of the second signal line switch SIS2.

The second signal line switch SIS2 electrically connects the other endof the second source switch SS2 to the second signal line SI2.

The third common switch CS3 electrically connects the first common lineCI1 and the display counter potential line COMI.

The fourth common switch CS4 electrically disconnects the first commonline CI1 from the second signal line SI2.

Thereby, the desired display is performed at the pixels 35 correspondingto the second signal line SI2.

The following are performed in the case where the display is performedat the pixel electrodes Px corresponding to the third signal line SI3(the period of the time t7).

The third signal line switch SIS3 electrically connects the third signalline SI3 to the other end of the first source switch SS1.

The first signal line switch SIS1 electrically connects the first signalline SI1 to the other end of the first source switch SS1.

Thereby, the desired display is performed at the pixels 35 correspondingto the third signal line SI3.

FIG. 9 is a schematic view showing the second operation of the displaydevice according to the first embodiment.

FIG. 9 is a timing chart of the second operation OP2 (the non-displayoperation) of the display device 110. The horizontal axis of FIG. 9 istime. In the embodiment, the sense operation is performed in the secondoperation OP2.

As shown in FIG. 9, the following are performed in the second operationOP2.

The terminal DDI-OUT is switched to the high resistance state Hi-Z.Namely, the first source switch SS1 electrically disconnects the firstsource circuit SC1 from the other end of the first signal line switchSIS1. The second source switch SS2 electrically disconnects the secondsource circuit SC2 from the other end of the second signal line switchSIS2.

A common selector signal VCOMSEL shown in FIG. 9 is, for example, thesignal that controls the first to fourth common switches CS1 to CS4. Thefirst common switch CS1 and the third common switch CS3 are switched tothe nonconducting state when the common selector signal VCOMSEL is inthe high state “H.” The second common switch CS2 and the fourth commonswitch CS4 are switched to the conducting state when the common selectorsignal VCOMSEL is in the low state “L.”

A signal TSVCOM shown in FIG. 9 is the signal that controls theconducting states of the first sense potential switch SVS1, the firstground potential switch SVSG1, the second sense potential switch SVS2,and the second ground potential switch SVSG2. One of the sense potentialswitch or the ground potential switch is switched to the conductingstate when the signal TSVCOM is in the high state “H.” The other of thesense potential switch or the ground potential switch is switched to theconducting state when the signal TSVCOM is in the low state “L.”

For example, by the control of the signal TSVCOM, the first sensepotential switch SVS1 and the first ground potential switch SVSG1electrically connect the other end of the first signal line SI1 to oneof the sense potential line SVI or the ground potential GND.

The first signal line switch SIS1 electrically connects the first signalline SI1 to the other end SO1 of the first sense potential switch SVS1.

The first common switch CS1 electrically disconnects the first commonline CI1 from the display counter potential line COMI.

The second common switch CS2 electrically connects the first common lineCI1 to the other end SO1 of the first sense potential switch SVS1 (i.e.,the first signal line SI1).

For example, the high-level potential (e.g., TPH) and the low-levelpotential (e.g., GND) are repeatedly applied alternately to the firstcommon line CI1 by the first sense potential switch SVS1 and the firstground potential switch SVSG1. The current that flows between themultiple fourth lines L4 and the first common line CI1 is sensed.

Thereby, sensing that uses the first common line CI1 is performed.

Further, the following are performed in the second operation OP2.

The second sense potential switch SVS2 and the second ground potentialswitch SVSG2 electrically connect the other end of the second signalline SI2 to one of the sense potential line SVI or the ground potentialGND.

The second signal line switch SIS2 electrically connects the secondsignal line SI2 to the other end SO2 of the second sense potentialswitch SVS2.

The third common switch CS3 electrically disconnects the first commonline CI1 from the display counter potential line COMI.

The fourth common switch CS4 electrically connects the first common lineCI1 to the other end SO2 of the second sense potential switch SVS2(i.e., the first signal line SI1).

Further, the following are performed in the second operation OP2.

The third signal line switch SIS3 electrically connects the third signalline SI3 to the other end SO1 of the first sense potential switch SVS1.

Thereby, in the second operation OP2, the first signal line SI1, thesecond signal line SI2, the third signal line SI3, and the first commonline CI1 are set to substantially the same potential. The sensing of thetouch input is performed in this state.

As shown in FIG. 9, the time between the start of a non-display periodNDT and the start of the high state “H” of the signal SEL1 and thesignal SEL2 is a time t31. These signals are in the high state “H” inthe period of a time t32.

The time between the start of the non-display period NDT and the startof the high state “H” of the common selector signal VCOMSEL is a timet38. The common selector signal VCOMSEL is in the high state “H” for asubsequent time t39.

In the non-display period NDT, the signal TSVCOM is repeatedly switchedalternately between the high state “H” and the low state “L.” The timeof the high state “H” is a time t41. The time of the low state “L” is atime t42. The time between the start of the non-display period NDT andthe start of the initial high state “H” of the signal TSVCOM is a timet40.

For example, the first operation OP1 described above is performed by thecontroller 63. The controller 63 is electrically connected to thecircuit unit 75 and the drive element 71. The controller 63 causes thecircuit unit 75 and the drive element 71 to implement the firstoperation OP1 and the second operation OP2 described below.

In the first operation OP1, the following are performed in the displayperiod DT. While setting one of the multiple first lines L1 to theselect potential, the image signals are supplied to the multiple secondlines L2; the selection pixel electrode Pxsel is set to the imagepotential based on the image signal; and at least one of the multiplethird lines L3 is set to the display counter potential COMDC.

On the other hand, in the non-display period NDT of the second operationOP2, the potential of at least one of the multiple second lines L2 isset to be the same as the potential of one of the multiple third linesL3. A state is formed in which the second lines L2 and the third linesL3 are in the same state. For example, the common selector COM_SEL isused to form this state.

FIG. 10 and FIG. 11 are circuit diagrams showing the display deviceaccording to the first embodiment.

FIG. 10 corresponds to the first operation OP1; and FIG. 11 correspondsto the second operation OP2.

As shown in FIG. 10 and FIG. 11, the display device 111 according to theembodiment includes a first circuit 311 and a second circuit 312. Thefirst circuit 311 and the second circuit 312 each include a shiftregister and a buffer.

A first output signal 311 a that is output from the first circuit 311controls the conducting state and nonconducting state of first switches313 a.

A second output signal 311 b that is output from the first circuit 311controls the conducting state and nonconducting state of second switches314 a.

A third output signal 312 a that is output from the second circuit 312controls the conducting state and nonconducting state of third switches313 b.

A fourth output signal 312 b that is output from the second circuit 312controls the conducting state and nonconducting state of fourth switches314 b.

An example is described hereinbelow in which the switch is in theconducting state when the signal input to the switch is in the highstate “H,” and the switch is in the nonconducting state when the signalinput to the switch is in the low state “L.” This is not limitedthereto. A switch may be used in which the state is the conducting statewhen the input signal is in the low state “L,” and the state is thenonconducting state when the input signal is in the high state “H.”

For example, the first switches 313 a correspond to the first groundpotential switch SVSG1.

For example, the second switches 314 a correspond to the first sensepotential switch SVS1.

For example, the third switches 313 b correspond to the second groundpotential switch SVSG2.

For example, the fourth switches 314 b correspond to the second sensepotential switch SVS2.

One end of the first switch 313 a is connected to one of lines TSIG1,TSIG2, TSIG3, or the like. These lines are set to a prescribedpotential, e.g., the ground potential GND. The other end of the firstswitch 313 a is connected to one end of the second switch 314 a. Theother end of the second switch 314 a is connected to an line TSVCOM1.For example, the line TSVCOM1 is set similarly to the signal TSVCOMshown in FIG. 9.

The first switches 313 a, the second switches 314 a, the third switches313 b, and the fourth switches 314 b correspond to the circuit unit 75shown in FIG. 6 and FIG. 7.

In the first operation OP1 (the display operation) as shown in FIG. 10,for example, the switches to which the first output signal 311 a and thesecond output signal 311 b are input are switched to the nonconductingstate when the first output signal 311 a and the second output signal311 b are in the low state “L.”

In the first operation OP1 (the display operation) as shown in FIG. 10,the first switches 313 a, the second switches 314 a, the third switches313 b, and the fourth switches 314 b are switched to the nonconductingstate. Switches 315 to which the common selector signal VCOMSEL is inputare electrically connected to an line 316 to which a common electrodedirect current potential VCOMDC is applied.

In the second operation OP2 (e.g., the sense operation of the touchinput), in the case where the portion corresponding to the first circuit311 is selected, for example, the first output signal 311 a is in thelow state; and the first switches 313 a to which the first output signal311 a is input are switched to the nonconducting state. On the otherhand, for example, the second output signal 311 b is in the high state;and the second switches 314 a to which the second output signal 311 b isinput are switched to the conducting state. The switches 315 to whichthe common selector signal VCOMSEL is input are electrically connectedto an line 317 to which the signal TSVCOM is applied.

In the second operation OP2 as shown in FIG. 11, in the case where theportion corresponding to the first circuit 311 is not selected, forexample, the first output signal 311 a is in the high state; and thefirst switches 313 a to which the first output signal 311 a is input areswitched to the conducting state. On the other hand, for example, thesecond output signal 311 b is in the low state; and the second switches314 a to which the second output signal 311 b is input are switched tothe nonconducting state. The switches 315 to which the common selectorsignal VCOMSEL is input are electrically connected to the line TSIG1 towhich the ground potential GND is applied.

For the second circuit 312, the case where the second circuit 312 isselected in the first operation OP1 and the second operation OP2 and thecase where the second circuit 312 is not selected in the secondoperation OP2 are similar to those described above.

The first operation OP1 and the second operation OP2 are performed bythe circuit configuration shown in FIG. 10 and FIG. 11. In the circuitconfiguration shown in FIG. 10 and FIG. 11, the first switches 313 a,the second switches 314 a, the third switches 313 b, the fourth switches314 b, the first circuit 311, and the second circuit 312 are disposedbetween the drive element 71 and the first substrate 10 (not shown).Thereby, a compact display device 111 is possible.

In the display device 110 (the display device 111) according to theembodiment, the third lines L3 are aligned with the second lines L2. Insuch a structure, the operations of connection and non-connectionbetween the second lines L2 and the third lines L3 are performed. Insuch a case, the circuit unit that performs such operations is disposedso that the circuit unit and the drive element 71 overlap. Thereby, acompact display device can be provided.

In the second operation OP2 (the sense operation of the touch input) ofthe display device 111, the signal TSVCOM is supplied to the signallines SL (the second lines L2). For example, the ground potential GND isapplied to the block of unselected common lines CL. For example, thefirst switches 313 a and the third switches 313 b are used as theswitches between the common lines CL and the ground potential GND usedat this time. In the embodiment, the drive element 71 and the path forsupplying the signal TSVCOM that includes the scanner overlap.

In the example recited above, the second lines L2 are connected to thethird lines L3 in the second operation OP2. The embodiment is notlimited thereto. In the second operation OP2 (the non-display periodNDT), the potential of at least one of the multiple second lines may beset to a floating potential. For example, in the second operation OP2, acapacitance is formed between the second lines L2 and the third lines L3by fixing potentials of the second lines L2 to be different from thepotentials of the third lines L3. Therefore, in the second operation OP2(e.g., the sense operation), the load capacitance relating to the thirdlines L3 becomes large; and the operation speed decreases. Conversely,in the second operation OP2, by setting the second lines L2 to thefloating potential, the capacitance can be small; and the operationspeed can be increased.

For example, the first switches 313 a, the third switches 313 b, and thelines TSIG1 to TSIG3 recited above also can be used as the input of testsignals. The operations of the display unit can be tested using the testsignals. For example, the desired signals are input to the lines TSIG1to TSIG3 while switching the first switches 313 a and the third switches313 b. Thereby, the test can be performed. A simple test of the imagequality can be performed prior to mounting the drive element 71 (thedrive IC). In other words, these circuits are used in both the operationof touch sensing and the operation of testing.

Second Embodiment

FIG. 12 is a schematic cross-sectional view showing a portion of adisplay device according to a second embodiment.

As shown in FIG. 12, the color filter layer 25 and multiple fifth linesL5 are further provided in the display device 112 according to theembodiment. Otherwise, the configuration described in regard to thedisplay device 110 (the display device 111) is applicable.

The color filter layer 25 includes a red filter layer RF, a green filterlayer GF, and a blue filter layer BF.

The color filter layer 25 includes a first boundary portion p1, a secondboundary portion p2, and a third boundary portion p3. The first boundaryportion p1 is the boundary portion between the red filter layer RF andthe green filter layer GF. The second boundary portion p2 is theboundary portion between the green filter layer GF and the blue filterlayer BF. The third boundary portion p3 is the boundary portion betweenthe blue filter layer BF and the red filter layer RF.

The multiple fifth lines L5 extend in the second direction (e.g., theY-axis direction). Each of the multiple fifth lines L5 is electricallyconnected to one of the multiple third lines L3. The electricalresistance of each of the multiple fifth lines L5 is lower than theelectrical resistance of each of the multiple third lines L3. The fifthlines L5 are used as supplemental lines of the third lines L3.

As described above, a light-transmissive conductive material is used asthe third line L3. On the other hand, the fifth line L5 includes amaterial (a metal or the like) having a low resistance. Thereby, theeffective resistance of the third line L3 can be reduced. The occurrenceof crosstalk can be suppressed.

In the example, the multiple fifth lines L5 overlap the first boundaryportion p1 or the second boundary portion p2 when projected onto the X-Yplane. The fifth lines L5 and the third boundary portion p3 may notoverlap.

The transmittance of the fifth line L5 is relatively low. The fifth lineL5 functions as a light-shielding film. Because the visibility of greenis high, there is a possibility that light leakage may occur at thefirst boundary portion p1 and the second boundary portion p2. In such acase, the light leakage can be suppressed by providing the fifth linesL5 so that the fifth lines L5 and the first boundary portion p1 overlap,and the fifth lines L5 and the second boundary portion p2 overlap. Thedisplay quality increases. On the other hand, the light leakage issuppressed at the third boundary portion p3 which is the boundaryportion between red and blue which have low visibility. Therefore, thefifth line L5 and the third boundary portion p3 may not overlap.

In the example, the third boundary portion p3 and at least one of gapsG3 between the multiple third lines L3 overlap when projected onto theX-Y plane. A uniform display is obtained easily by disposing the gap G3at the position of the third boundary portion p3 where the light leakageis low.

As shown in FIG. 12, a light-shielding layer 27 (e.g., a black matrix)may be further provided. When projected onto the X-Y plane, thelight-shielding layer 27 has a portion that overlaps the first boundaryportion p1, the second boundary portion p2, and the third boundaryportion p3. Thereby, the light leakage can be suppressed further; and ahigher-quality display is obtained.

The light-shielding layer 27 includes chrome, a chromic compound, etc. Ablack resin may be used as the light-shielding layer 27. A stacked filmin which two or more of the red filter layer RF, the green filter layerGF, or the blue filter layer BF are stacked may be used as thelight-shielding layer 27.

The configuration and operations described in regard to the firstembodiment may be combined with the second embodiment.

Third Embodiment

FIG. 13 is a schematic perspective view showing an electronic deviceaccording to a third embodiment.

As shown in FIG. 13, the electronic device 510 according to theembodiment includes the display device 110 and a controller of thedisplay device 110. The display devices and the modifications of thedisplay devices described in regard to the first and second embodimentsmay be used as the display device. In the example, the electronic device510 further includes a housing 580 having an interior in which thedisplay device 110 is contained. For example, a mobile telephone, apersonal digital assistant, a personal computer, various informationdevices, etc., are used as the electronic device 510.

In the electronic device 510 according to the embodiment, a compactelectronic device can be provided by using the display devices accordingto the first and second embodiments.

According to the embodiment, a compact display device can be provided.

In the specification of the application, “perpendicular” and “parallel”include not only strictly perpendicular and strictly parallel but also,for example, the fluctuation due to manufacturing processes, etc.; andit is sufficient to be substantially perpendicular and substantiallyparallel.

Hereinabove, embodiments of the invention are described with referenceto specific examples. However, the invention is not limited to thesespecific examples. For example, one skilled in the art may similarlypractice the invention by appropriately selecting specificconfigurations of components included in the display device such as theline, the switch element, the display function layer, the insulatinglayer, the drive unit, the switch, the selector, the circuit, etc., fromknown art; and such practice is within the scope of the invention to theextent that similar effects can be obtained.

Further, any two or more components of the specific examples may becombined within the extent of technical feasibility and are within thescope of the invention to the extent that the spirit of the invention isincluded.

All display devices practicable by an appropriate design modification byone skilled in the art based on the display devices described above asembodiments of the invention are within the scope of the invention tothe extent that the spirit of the invention is included.

Various modifications and alterations within the spirit of the inventionwill be readily apparent to those skilled in the art; and all suchmodifications and alterations should be seen as being within the scopeof the invention.

For example, additions, deletions, or design modifications of componentsor additions, omissions, or condition modifications of processesappropriately made by one skilled in the art in regard to theembodiments described above are within the scope of the invention to theextent that the spirit of the invention is included.

Other effects produced by the forms described in the embodiment that areapparent from the specification or readily apparent to one skilled inthe art naturally should be seen as being within the scope of theinvention.

(1) An embodiment of the disclosed invention is a display deviceincluding:

a first substrate unit including

-   -   a first substrate having a first surface including a display        region and a peripheral region,    -   a display unit provided in the display region, the display unit        including        -   multiple first lines extending in a first direction and            being arranged in a second direction intersecting the first            direction, the first direction intersecting a direction from            the peripheral region toward the display region,        -   multiple second lines extending in the second direction and            being arranged in the first direction,        -   multiple switch elements, each of the multiple switch            elements being electrically connected to one of the multiple            first lines and one of the multiple second lines,        -   multiple pixel electrodes electrically connected            respectively to the multiple switch elements, and        -   multiple third lines extending in the second direction and            being arranged in the first direction, and    -   a circuit unit provided in the peripheral region and        electrically connected to at least one of the multiple second        lines and at least one of the multiple third lines;

a second substrate unit including

-   -   a second substrate having a second surface and a third surface,        the second surface opposing the first surface, the third surface        being on a side opposite to the second surface, and    -   multiple fourth lines provided at the third surface, the        multiple fourth lines extending in a third direction and being        arranged in a fourth direction, the third direction being        parallel to the third surface and intersecting the second        direction, the fourth direction being parallel to the third        surface and intersecting the third direction;

a display function layer provided between the first substrate unit andthe second substrate unit, the display function layer performing anoptical operation based on an electrical signal applied to the multiplepixel electrodes; and

a drive element provided on the peripheral region, the drive elementbeing capable of outputting the electrical signal to the circuit unit,

at least a portion of the circuit unit being disposed between the driveelement and the first substrate.

(2) An embodiment of the disclosed invention is the display deviceaccording to (1), further including a controller electrically connectedto the circuit unit and the drive element,

the controller causing the circuit unit and the drive element toimplement a first operation and a second operation,

the first operation including, in a display period:

-   -   selecting one of the multiple switch elements, the one of the        multiple switch elements being connected to one of the multiple        first lines and one of the multiple second lines;    -   applying an image potential to a pixel electrode of the multiple        pixel electrodes electrically connected to the selected switch        element; and    -   applying a display counter potential to at least one of the        multiple third lines,

the second operation including, in a non-display period, setting apotential of at least one of the multiple second lines to the samepotential as a potential of one of the multiple third lines.

(3) An embodiment of the disclosed invention is the display deviceaccording to (1) or (2), including a sensor sensing, in the secondoperation, a change of a capacitance formed between at least one of themultiple fourth lines and at least one of the multiple third lines.

(4) An embodiment of the disclosed invention is the display deviceaccording to (2) or (3), further including:

a display counter potential line set to the display counter potential;

a selector switch; and

a common selector,

one end of the circuit unit being electrically connected to the driveelement, one other end of the circuit unit being electrically connectedto the selector switch and the common selector, wherein:

in the first operation, the selector switch electrically connects thecircuit unit and each of the multiple second lines, and the commonselector electrically connects the display counter potential line andeach of the multiple third lines,

in the second operation, the circuit unit electrically disconnects thedrive element from each of the multiple second lines, and the commonselector electrically connecting at least one of the multiple thirdlines and at least one of the multiple second lines.

(5) An embodiment of the disclosed invention is the display deviceaccording to (2) or (3), including:

a sense potential line set to a sense potential different from thedisplay counter potential; and

a ground potential line having a potential different from the sensepotential,

the drive element including a source circuit capable of outputting aportion of the electrical signal,

the circuit unit including:

-   -   a sense potential switch, one end of the sense potential switch        being electrically connected to the sense potential line, one        other end of the sense potential switch being electrically        connected to an output of the source circuit; and    -   a ground potential switch, one end of the ground potential        switch being electrically connected to the sense potential line,        one other end of the ground potential switch being connected to        the ground potential line.

(6) An embodiment of the disclosed invention is the display deviceaccording to (5), wherein

the multiple second lines include a signal line, and

the display device further includes a signal line switch, one end of thesignal line switch being connected to the first signal line, one otherend of the signal line switch being connected to the one other end ofthe sense potential switch.

(7) An embodiment of the disclosed invention is the display deviceaccording to (6), wherein

the multiple third lines include a common line, and

the display device further includes:

-   -   a display counter potential line set to the display counter        potential;    -   a first common switch, one end of the first common switch being        connected to the common line, one other end of the first common        switch being connected to the counter potential line; and    -   a second common switch, one end of the second common switch        being connected to the common line, one other end of the second        common switch being connected to the signal line.

(8) An embodiment of the disclosed invention is the display deviceaccording to (7), wherein, in the first operation,

the sense potential switch electrically disconnects the display counterpotential line from the output of the source circuit,

the ground potential switch electrically disconnects the groundpotential line from the output of the source circuit,

the signal line switch electrically connects the signal line to theoutput of the source circuit,

the first common switch electrically connects the common line to thedisplay counter potential line, and

the second common switch electrically connects the common line to thesignal line.

(9) An embodiment of the disclosed invention is the display deviceaccording to (7) or (8), wherein, in the second operation,

the display counter potential line is electrically connected to one ofthe ground potential line or the output of the source circuit by thesense potential switch and the ground potential switch,

the signal line switch electrically connects the signal line to the oneother end of the ground potential switch,

the first common switch electrically disconnects the common line fromthe display counter potential line, and

the second common switch electrically connects the common line to thesignal line.

(10) An embodiment of the disclosed invention is the display deviceaccording to (1), further including a controller electrically connectedto the circuit unit and the drive element,

the controller causing the circuit unit and the drive element toimplement a first operation and a second operation,

the first operation including, in a display period:

-   -   selecting one of the multiple switch elements, the one of the        multiple switch elements being connected to one of the multiple        first lines and one of the multiple second lines; and    -   applying an image potential to a pixel electrode of the multiple        pixel electrodes electrically connected to the selected switch        element, and    -   applying a display counter potential to at least one of the        multiple third lines,

the second operation including, in a non-display period, setting apotential of at least one of the multiple second lines to a floatingpotential.

(11) An embodiment of the disclosed invention is the display deviceaccording to any one of (1) to (10), further including a connectingconductive member,

the drive element including a lower surface electrode provided at asurface of the drive element on the first substrate side,

the first substrate unit further including an line electrode provided inthe peripheral region,

the connecting conductive member being disposed between the lowersurface electrode and the line electrode to electrically connect thelower surface electrode and the line electrode.

(12) An embodiment of the disclosed invention is the display deviceaccording to any one of (1) to (11), wherein the drive element and thesecond substrate unit do not overlap when projected onto the firstsurface.

(13) An embodiment of the disclosed invention is the display deviceaccording to any one of (1) to (12), further including:

a color filter layer including a red filter layer, a green filter layer,and a blue filter layer; and

multiple fifth lines extending in the second direction,

the color filter layer including a first boundary portion between thered filter layer and the green filter layer, a second boundary portionbetween the green filter layer and the blue filter layer, and a thirdboundary portion between the blue filter layer and the red filter layer,

each of the multiple fifth lines being electrically connected to one ofthe multiple third lines,

an electrical resistance of each of the multiple fifth lines being lowerthan an electrical resistance of each of the multiple third lines,

the multiple fifth lines overlapping the first boundary portion or thesecond boundary portion and not overlapping the third boundary portionwhen projected onto a plane including the first direction and the seconddirection.

(14) An embodiment of the disclosed invention is the display deviceaccording to (13), wherein the third boundary portion and at least oneof gaps between the multiple third lines overlap when projected onto theplane including the first direction and the second direction.

(15) An embodiment of the disclosed invention is the display deviceaccording to any one of (1) to (12), further including a color filterlayer including a red filter layer, a green filter layer, and a bluefilter layer,

the color filter layer including a first boundary portion between thered filter layer and the green filter layer, a second boundary portionbetween the green filter layer and the blue filter layer, and a thirdboundary portion between the blue filter layer and the red filter layer,

the third boundary portion and at least one of gaps between the multiplethird lines overlapping when projected onto the plane including thefirst direction and the second direction.

What is claimed is:
 1. A display device comprising: a display region and a peripheral region, a plurality of pixels in the display region, a plurality of signal lines being arranged in a first direction and extending in a second direction intersecting the first direction, a plurality of common lines being arranged in the first direction and extending in the second direction, a signal supplying circuit for supplying a control signal with an amplitude and a period, a switching element including a first switch and a second switch, wherein the first switch is connected to one of the signal lines and the second switch is connected to one of the common lines, wherein the signal lines are provided according to the number of multiple pixels arranged along the first direction, the amplitude of the control signal is a difference between a high level potential and a low level potential, the display device is operated in a display operation and an input sensing operation, in the input sensing operation, the amplitude of the control signal supplied to at least one of the signal lines through the first switch is same as the amplitude of the control signal supplied to at least one of the common lines through the second switch.
 2. The display device according to claim 1, wherein in the input sensing operation, the period of the control signal supplied to at least one of the signal lines is same as the period of the control signal supplied to at least one of the common lines.
 3. The display device according to claim 1, wherein the common lines are provided opposing the signal lines.
 4. The display device according to claim 1, further comprising: a circuit section provided in the peripheral region, a selector switch circuit, wherein the common lines extend beyond the selector switch circuit, in the display operation, the selector switch circuit electrically connects the circuit section and each of the plurality of signal lines.
 5. The display device according to claim 1, wherein a touch input may be sensed by sensing an electric field generated between the common lines and an input object.
 6. A display device comprising: a display region and a peripheral region, a plurality of pixels in the display region, a plurality of signal lines being arranged in a first direction and extending in a second direction intersecting the first direction, a plurality of common lines being arranged in the first direction and extending in the second direction, a circuit section provided in the peripheral region, a selector switch circuit, a switching element including a first switch and a second switch, wherein the first switch is connected to one of the signal lines and the second switch is connected to one of the common lines, wherein the signal lines are provided according to the number of multiple pixels arranged along the first direction, the common lines extend beyond the selector switch circuit, the display device is operated in a display operation and an input sensing operation, in the display operation, the selector switch circuit electrically connects the circuit section and each of the plurality of signal lines, in the display operation, the first switch is in a conducting state and the second switch is in a nonconductive state.
 7. The display device according to claim 6, further comprising: a signal supplying circuit for supplying a control signal with an amplitude and a period, wherein the signal lines are provided according to the number of multiple pixels arranged along the first direction, the amplitude of the control signal is a difference between a high level potential and a low level potential in the input sensing operation, the amplitude of the control signal supplied to at least one of the signal lines is same as the amplitude of the control signal supplied to at least one of the common lines.
 8. The display device according to claim 7, wherein in the input sensing operation, the period of the control signal supplied to at least one of the signal lines is same as the period of the control signal supplied to at least one of the common lines.
 9. The display device according to claim 6, wherein the common lines are provided opposing the signal lines.
 10. The display device according to claim 6, wherein a touch input may be sensed by sensing an electric field generated between the common lines and an input object. 